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Prediction of micromixing effects in precipitation: Case of double‐jet precipitators

Identifieur interne : 002D16 ( Main/Merge ); précédent : 002D15; suivant : 002D17

Prediction of micromixing effects in precipitation: Case of double‐jet precipitators

Auteurs : René David [France] ; Bruno Marcant [France]

Source :

AIChE Journal [ 0001-1541 ] ; 1994-03.

RBID : ISTEX:DCDE3C8815A9D04A717F10818527E5945396B367

English descriptors

KwdEn :
- Aiche, Aiche journal, Average crystal size, Average size, Barium, Barium sulfate, Barium sulphate precipitation, Base case zone, Bulk fluid, Calcium oxalate monohydrate, Chem, Chemical reaction, Circulation time, Crystal number, Crystal size, Diffusional growth, Entire feedstocks, Entire tank, Experimental conditions, Experimental results, Feed location, Feed locations, Feed points, Feed rate, Feed streams, Feed tubes, Final distribution, Final volume, Flow rates, High turbulence region, Initial fraction volume, Initial volume, Marcant, Micromixing, Micromixing effects, Molecular level, Nucleation, Nucleation efficiency, Nucleation flux, Nucleation rate, Other hand, Other processes, Oxalate, Precipitation, Precipitator, Primary nucleation, Primary nucleation flux, Primary nucleation rate, Reactant, Reactive species, Same conditions, Secondary nucleation, Semibatch, Significant consumption, Space time, Sulfate, Supersaturation, Tank reactors, Tosun, Total nucleation flux, Turbulence region, Turbulent region, Volume ratio.
Teeft :
- Aiche, Aiche journal, Average crystal size, Average size, Barium, Barium sulfate, Barium sulphate precipitation, Base case zone, Bulk fluid, Calcium oxalate monohydrate, Chem, Chemical reaction, Circulation time, Crystal number, Crystal size, Diffusional growth, Entire feedstocks, Entire tank, Experimental conditions, Experimental results, Feed location, Feed locations, Feed points, Feed rate, Feed streams, Feed tubes, Final distribution, Final volume, Flow rates, High turbulence region, Initial fraction volume, Initial volume, Marcant, Micromixing, Micromixing effects, Molecular level, Nucleation, Nucleation efficiency, Nucleation flux, Nucleation rate, Other hand, Other processes, Oxalate, Precipitation, Precipitator, Primary nucleation, Primary nucleation flux, Primary nucleation rate, Reactant, Reactive species, Same conditions, Secondary nucleation, Semibatch, Significant consumption, Space time, Sulfate, Supersaturation, Tank reactors, Tosun, Total nucleation flux, Turbulence region, Turbulent region, Volume ratio.

Abstract

Mixing effects are evaluated for double jet semibatch and continuous stirred precipitators by a model which gives the variation of the primary nucleation flux from the mixing conditions. The predicted trends are compared with results of various authors, including those from a new study of calcium oxalate semibatch double‐jet precipitation. Satisfactory qualitative agreement is found for the different chemical systems as a function of feed rate, stirring speed and feed locations for calcium oxalate precipitation. Two types of precipitation systems are demonstrated, depending on the ratio added/tank volume, the initial supersaturations and the intrinsic stiffness factor of a given precipitation. The difference between the two types depends on the increase or reduction of the primary nucleation flux by imperfect mixing with respect to the reference primary nucleation flux obtained with perfect mixing.

Url:

https://api.istex.fr/document/DCDE3C8815A9D04A717F10818527E5945396B367/fulltext/pdf

DOI: 10.1002/aic.690400306

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Le document en format XML

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<term>Barium</term>
<term>Barium sulfate</term>
<term>Barium sulphate precipitation</term>
<term>Base case zone</term>
<term>Bulk fluid</term>
<term>Calcium oxalate monohydrate</term>
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<term>Chemical reaction</term>
<term>Circulation time</term>
<term>Crystal number</term>
<term>Crystal size</term>
<term>Diffusional growth</term>
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<term>Entire tank</term>
<term>Experimental conditions</term>
<term>Experimental results</term>
<term>Feed location</term>
<term>Feed locations</term>
<term>Feed points</term>
<term>Feed rate</term>
<term>Feed streams</term>
<term>Feed tubes</term>
<term>Final distribution</term>
<term>Final volume</term>
<term>Flow rates</term>
<term>High turbulence region</term>
<term>Initial fraction volume</term>
<term>Initial volume</term>
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<term>Micromixing</term>
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<term>Oxalate</term>
<term>Precipitation</term>
<term>Precipitator</term>
<term>Primary nucleation</term>
<term>Primary nucleation flux</term>
<term>Primary nucleation rate</term>
<term>Reactant</term>
<term>Reactive species</term>
<term>Same conditions</term>
<term>Secondary nucleation</term>
<term>Semibatch</term>
<term>Significant consumption</term>
<term>Space time</term>
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<term>Supersaturation</term>
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<term>Average crystal size</term>
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<term>Barium sulfate</term>
<term>Barium sulphate precipitation</term>
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<term>Bulk fluid</term>
<term>Calcium oxalate monohydrate</term>
<term>Chem</term>
<term>Chemical reaction</term>
<term>Circulation time</term>
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<term>Crystal size</term>
<term>Diffusional growth</term>
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<term>Experimental conditions</term>
<term>Experimental results</term>
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<term>Feed streams</term>
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<term>Molecular level</term>
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<term>Significant consumption</term>
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<front><div type="abstract" xml:lang="en">Mixing effects are evaluated for double jet semibatch and continuous stirred precipitators by a model which gives the variation of the primary nucleation flux from the mixing conditions. The predicted trends are compared with results of various authors, including those from a new study of calcium oxalate semibatch double‐jet precipitation. Satisfactory qualitative agreement is found for the different chemical systems as a function of feed rate, stirring speed and feed locations for calcium oxalate precipitation. Two types of precipitation systems are demonstrated, depending on the ratio added/tank volume, the initial supersaturations and the intrinsic stiffness factor of a given precipitation. The difference between the two types depends on the increase or reduction of the primary nucleation flux by imperfect mixing with respect to the reference primary nucleation flux obtained with perfect mixing.</div>
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Prediction of micromixing effects in precipitation: Case of double‐jet precipitators

Prediction of micromixing effects in precipitation: Case of double‐jet precipitators

Source :

English descriptors

Abstract

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